Clothing factories in the Bangladeshi capital of Dhaka have re-opened following the collapse of a building last week which killed more than 400 workers.

It is believed more than a million workers walked off the job eight days ago when the eight-storey Rana Plaza collapsed, killing and injuring hundreds of people, with more than 140 people still missing.

Protests have been held across Dhaka over the last week against the slave-like conditions in many of the city's busiest factories.

"All factories have opened today and the workers have returned to work," Bangladesh Garments Manufacturers and Exporters Association vice president Shahidullah Azim said.

"We don't have any reports of protests or violence."

Clothing manufacturing in Bangladesh:

Around 4,500 factories produce clothes for many of the world's major brands